<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>

    </title>
    <style>
        .box{
            width: 200px;
            height: 
            200px;
            margin: 50px auto;
           border-radius: 50%;
            background-color: rgb(180, 54, 54);
            border: 4px solid rebeccapurple;
           }
           .box1{
               font-size: 80px;
               width: 400px;
               height: 100px;
               color: #000;
               text-align: center;
               background-color: green;
               margin: 40px auto;
               border-radius: 200px;
           }
           .box1:hover{
               background-color: aliceblue;
           }
    </style>
</head>
<body>
    <div class="box
    "></div>
    <div class="box1">立即登录</div>
</body>
</html>